int result = getSuccessor(index);
    return (result == ENDPOINT) ? -1 : result;
  }

  @Override
  int nextIndexAfterRemove(int oldNextIndex, int removedIndex) {
    return (oldNextIndex == size()) ? removedIndex : oldNextIndex;
  }

  private int getPredecessor(int entry) {
    return (int) (links[entry] >>> 32);
  }

  private int getSuccessor(int entry) {
    return (int) links[entry];

    int srcIndex = size() - 1;
    super.moveLastEntry(dstIndex, mask);

    setSucceeds(getPredecessor(dstIndex), getSuccessor(dstIndex));
    if (dstIndex < srcIndex) {
      setSucceeds(getPredecessor(srcIndex), dstIndex);
      setSucceeds(dstIndex, getSuccessor(srcIndex));
    }
    requirePredecessors()[srcIndex] = 0;
    requireSuccessors()[srcIndex] = 0;
  }

  @Override